Jessica Simpson has been flying solo recently , but she has yet to file separation papers from husband Nick Lachey.

Harvey Levin, the managing editor of TMZ.com has learned that Simpson may be rethinking the high-stakes separation.

"I don't think she has the stomach for a divorce," Levin said. "She made $850,000 at a concert this week, and you'd think since Nick would be entitled to half, she would have moved to protect her finances."

"There is no anger," Levin continued. "They are e-mailing each other. It's really hard for them right now, especially Nick."

But if the split does end in divorce, it could turn into the big bucks breakup of the year. Nick and Jessica's assets include their $3 million "Newlyweds" home in Calabasas, Calif., a $1.25 million Las Vegas condo, matching black $84,000 BMWs, a $75,000 Land Rover and Nick's $785,000 Ferrari.

Jessica has made an estimated $35 million this year, some of which came from her cosmetics and clothing line empire.

But that's not all. Simpson recently told us, "I have a workout video coming out, and I have a show line that's adorable."

Famed divorce attorney Raoul Fleder told us the split could be a goldmine for Lachey. "We say California is a 50/50 state," Felder said. "My guess is she's crying her eyes out that there is no pre-nup."